水翁花黄酮DMC诱导肝癌细胞SMMC-7721凋亡的机制研究

目的:研究水翁花黄酮类化合物2’,4’-二羟基-6’-甲氧基-3’,5’-二甲基查耳酮(DMC)体外诱导人肝癌细胞SMMC-7721凋亡作用及其分子机制。方法:采用改进的Sellins-Cohen方法检测不同浓度的DMC对SMMC-7721细胞DNA片段化的影响。用PCR-ELISA法测定肿瘤细胞的端粒酶活性,用半定量RT-PCR法测定c-myc和人端粒酶逆转录酶(hTERT)的mRNA表达量,Western blot法检测c-myc及hTERT蛋白的表达。结果:DMC作用于人肝癌SMMC-7721细胞后,引起SMMC-7721细胞DNA片段化率增大,片段化率效果有明显的浓度依赖性。与对照组相比,20μmol·L-1DMC处理48 h后,肝癌细胞的端粒酶活性下降了(66.2±2.1)%。c-myc和hTERT的mRNA表达水平分别下降了(67.3±2.1)%,(64.4±2.3)%,c-myc和hTERT的蛋白表达水平分别下降了(69.6±1.9)%,(71.3±2.4)%。结论:DMC能诱导SMMC-7721细胞凋亡,其凋亡机制可能与c-myc基因和hTERT的mRNA以及蛋白的表达降低有关。     

鳖甲煎丸含药血清对SMMC-7721肝癌细胞凋亡的影响

目的研究鳖甲煎丸含药血清对SMMC-7721肝癌细胞凋亡的影响。方法采用MTT法检测鳖甲煎丸不同浓度含药血清(0%、2%、4%、6%、8%、10%、12%、14%、16%)对肝癌细胞增殖抑制作用;流式细胞术检测鳖甲煎丸含药血清对SMMC-7721细胞凋亡的影响;实时荧光定量PCR检测鳖甲煎丸含药血清对SMMC-7721细胞BAX、Bcl-2、STAT3 mRNA表达;Western blot法检测细胞BAX、Bcl-2、STAT3、p-STAT3蛋白表达。结果分别处理SMMC-7721细胞24、28 h,鳖甲煎丸含药血清能明显抑制肝癌细胞的增殖,具有浓度依赖性。鳖甲煎丸含药血清(5%、10%、15%)作用肝癌细胞24 h后,细胞总凋亡率显著增高(P0.01),随浓度增加而增高。与空白对照组比较,鳖甲煎丸含药血清(10%、15%)上调BAX mRNA表达(P0.05),而BAX蛋白表达不明显;除5%含药血清鳖甲煎丸组Bcl-2 mRNA外,鳖甲煎丸含药血清(5%、10%、15%)下调Bcl-2、STAT3 mRNA和蛋白表达,并能抑制STAT3磷酸化,升高BAX/Bcl-2比值(P0.05,P0.01)。结论鳖甲煎丸含药血清诱导SMMC-7721肝癌细胞发生凋亡可能与影响STAT信号通路有关。     

积雪草酸对人肝癌SMMC-7721细胞增殖、迁移及凋亡的影响

目的:观察积雪草酸对人肝癌SMMC-7721细胞增殖、迁移及凋亡的影响。方法:用不同浓度的积雪草酸处理人肝癌SMMC-7721细胞;MTT法检测积雪草酸对人肝癌SMMC-7721细胞增殖的影响;流式细胞术检测积雪草酸对人肝癌SMMC-7721细胞凋亡的影响;Transwell小室法检测积雪草酸对肝癌细胞迁移的影响;Western blot法检测积雪草酸对凋亡相关基因Bcl-2和Bax及上皮间质转化标志基因E-cadherin表达的影响。结果:与对照组比较,25、50、100μmol/L的积雪草酸对人肝癌SMMC-7721细胞增殖均有明显的抑制作用,差异均有统计学意义(P0.01)。流式细胞术结果显示,50μmol/L的积雪草酸处理后,肝癌细胞凋亡率显著增加,与对照组比较,差异有统计学意义(P0.01)。Transwell小室法检测结果发现,TGF-β能显著促进人肝癌SMMC-7721细胞迁移,与对照组比较,差异有统计学意义(P0.01)。1、10μmol/L的积雪草酸处理能够显著抑制TGF-β诱导的肝癌细胞迁移。积雪草酸处理后,人肝癌SMMC-7721细胞Bcl-2蛋白水平显著下降,Bax蛋白水平显著上调。TGF-β处理24 h后,SMMC-7721细胞E-cadherin表达水平显著降低,而不同浓度的积雪草酸均能抑制TGF-β诱导的E-cadherin表达水平下调。结论:积雪草酸能显著抑制人肝癌SMMC-7721细胞增殖和迁移,诱导细胞凋亡。     

白花蛇舌草注射剂抑制人肝癌细胞SMMC-7721增殖及调控Bcl-2/CytC信号通路诱导线粒体凋亡

目的评估白花蛇舌草注射液在诱导人肝癌SMMC-7721细胞凋亡作用相关机制。方法体外培养人肝癌SMMC-7721细胞,MTT法观察细胞在白花蛇舌草注射液作用后24、48 h的增殖变化;使用倒置显微镜和透射电镜对细胞进行形态学观察;应用Western blot法检测Bax、Bcl-2、Caspase-3、Cyt C蛋白的表达。结果白花蛇舌草注射液能抑制SMMC-7721细胞增殖且呈剂量依赖性;电镜下观察100μg/m L白花蛇舌草注射液作用后,引起染色质固缩、边移,出现早期凋亡现象;白花蛇舌草注射液处理24 h后可引起Bax蛋白表达上调,Bcl-2蛋白表达下调,Bcl-2/Bax比值降低,释放Cyt C,激活Caspase-3蛋白表达。结论白花蛇舌草注射液可以抑制人肝癌SMMC-7721细胞增殖,诱导其凋亡,可能与其调控Bcl-2/Cyt C信号通路相关。     

红花多糖对人肝癌SMMC-7721细胞Bcl-2与 Bax基因转录及蛋白表达的影响

目的:研究红花多糖(SPS)体外抑制人肝癌细胞株SMMC-7721增殖、诱导凋亡及对凋亡调控基因Bax,Bcl-2基因转录和蛋白表达的影响,探讨SPS诱导SMMC-7721细胞凋亡的机制.方法:不同剂量的SPS(0,0.02,0.04,0.08,0.16,0.32,0.64,1.28 g·L-1)分别作用于体外培养的SMMC-7721细胞,采用四甲基偶氮唑盐比色法(MTT)检测细胞的抑制率;用Ca2+依赖性磷脂结合蛋白( Annexin V)-异硫氰酸荧光素(FITC)/碘化丙啶(PI)双染法观察细胞凋亡的形态学改变;通过罗丹明123( Rho123)荧光显微镜检测线粒体膜电位(△Ψm);以实时荧光定量PCR技术(real-time PCR)和蛋白免疫印迹(Western blotting)法检测细胞凋亡相关因子Bcl-2及Bax mRNA水平和蛋白水平的表达情况.结果:SPS对体外培养的人肝癌SMMC-7721细胞具有抑制增殖作用,且具有明显的时间和剂量相关性;荧光显微镜下SPS作用的细胞呈现典型的凋亡细胞形态;肝癌细胞内Rho123荧光强度明显减弱.SPS作用后细胞内Bcl-2蛋白和mRNA表达水平均降低,Bax蛋白和mRNA的表达水平均升高,二者的变化趋势均呈一定的时间依赖关系;而且,Bcl-2/Bax比值随SPS时间的延长显著降低且变化趋势均呈一定的时间依赖关系.结论:SPS能够显著抑制人肝癌细胞SMMC-7721增殖,诱导SMMC-7721细胞凋亡,其作用机制可能与上调Bax的表达及下调Bcl-2的表达和降低线粒体膜电位有关.     

贝母素乙诱导人肝癌SMMC-7721细胞凋亡的分子机制研究

目的:探讨贝母素乙对人肝癌细胞SMMC-7721凋亡的影响及其分子机制。方法:采用四甲基偶氮唑盐(methyl thiazolyl tetrazdium,MTT)法检测贝母素乙对人肝癌细胞SMMC-7721的抑制率;采用荧光染色和流式细胞术研究贝母素乙对细胞凋亡的影响;通过电子显微镜观察贝母素乙处理的人肝癌SMMC-7721细胞超微结构变化情况;Western blot方法检测贝母素乙处理后细胞凋亡相关蛋白的表达。结果:贝母素乙对肝癌SMMC-7721细胞的生长有显著抑制作用,24 h半数致死剂量(IC_(50))为0.625μg/mL。SMMC-7721细胞经不同浓度贝母素乙处理后早期凋亡和晚期凋亡细胞数量均升高。随着药物浓度的增加,细胞线粒体膜电位依次增大,SMMC-7721细胞的Caspase-3、Caspase-8和Caspase-9的活性依次升高;经贝母素乙作用后Bcl-2的蛋白表达降低,Bax蛋白表达升高;procapas-3和procapas-8的蛋白表达降低,Caspas-3和Caspas-9的表达升高。结论:贝母素乙可通过线粒体途径诱导肝癌SMMC-7721细胞凋亡。     

槲皮素对SMMC-7721肝癌细胞PI3K/AKT信号通路影响的探讨

目的:观察槲皮素( quercetin)对人肝癌细胞SMMC-7721增殖与细胞凋亡的影响,探讨其对SMMC-7721细胞PI3K/AKT信号通路的影响.方法:采用MTT法检测槲皮素对SMMC-7721细胞生长的抑制,流式细胞术检测细胞周期变化,Western blot检测槲皮素对SMMC-7721细胞PI3K/AKT信号通路凋亡相关蛋白表达的影响.结果:槲皮素抑制SMMC-7721肝癌细胞增殖作用明显,且呈浓度和时间依赖性.顺铂和槲皮素40,80,160,320 μmol·L-148 h抑制率分别为62.19％,25.47％,27.18％,36.96％,51.28％.流式细胞术结果提示,槲皮素80,160,320μmol ·L -可使SMMC-7721肝癌细胞周期阻滞于G0/G1期.Western blot凋亡相关蛋白表达检测表明,药物组AKT的表达受抑制,PTEN,Caspase-9蛋白的表达率随着药物浓度的增加而增加.结论:槲皮素能诱导SMMC-7721肝癌细胞凋亡,其机制可能是使肝癌细胞SMMC-7721周期阻滞于G0/G1期,PTEN的过表达抑制AKT活化,激活Caspase-9从而促进细胞凋亡.     

半枝莲提取物诱导人肝癌SMMC-7721细胞凋亡及其对凋亡相关蛋白表达的影响

目的探讨半枝莲提取物(Scutellaria barbata D.Don extract,SBE)对人肝癌SMMC-7721细胞凋亡及凋亡相关蛋白Bcl-2,Survivin和Caspase-3表达的影响。方法体外培养SMMC-7721细胞,以2.5,5和10 mg.L-1SBE处理48 h,并以2.5 mg.L-1顺铂(DDP)作为阳性对照。用MTT法检测细胞抑制率,流式细胞仪检测细胞凋亡率,二步法免疫组化检测Bcl-2,Survivin和Caspase-3蛋白表达。结果与正常对照组相比,SBE各浓度组细胞抑制率显著升高(P(0.001),细胞凋亡率明显上升(P(0.01),Caspase-3蛋白表达显著上升(P<0.01或P<0.05),Bcl-2和Survivin蛋白表达明显下降(P<0.01或P<0.05)。结论SBE具有诱导肝癌SMMC-7721细胞凋亡的作用,其分子机制可能与上调Caspase-3蛋白表达以及下调Bcl-2和Survivin蛋白表达有关。     

响应面优化提取蚕蛹多糖及其抗肿瘤活性研究

目的:以蚕蛹中的多糖组分为研究对象,优化提取工艺以及研究其抗癌的生物活性。方法:在单因素试验基础上,以微波时间、微波功率、料液比为自变量,蚕蛹多糖收率为响应值,采用中心组合设计方法研究各自变量及其交互作用对多糖收率的影响。CCK-8法检测蚕蛹多糖提取物对SMMC-7721人肝癌细胞生长的抑制情况。Western blot检测细胞凋亡相关蛋白(Bax、Bcl-2和p53)的表达。结果:优化得到的蚕蛹多糖提取条件为:微波时间23.61 min、微波功率516.25 W、料液比1∶28.26(g/mL),多糖收率为4.9%。CCK-8结果分析表明,蚕蛹多糖提取物对SMMC-7721细胞的增殖具有抑制作用,且呈时间和浓度依赖性(P0.01),其24、48和72 h的半数抑制浓度(IC50)分别为6.606、4.114、2.569 mg/mL。Western blot检测结果表明,随着多糖提取物浓度增大,SMMC-7721细胞Bax、p53蛋白的表达逐渐升高,细胞Bcl-2蛋白的表达逐渐降低。结论:响应面法优化微波提取蚕蛹多糖,工艺简便。蚕蛹多糖提取物具有一定的抗癌活性。     

姜黄素对人前列腺增生间质细胞凋亡及Bcl02,Bax表达的影响

目的:研究姜黄素对人前列腺增生间质细胞凋亡的诱导作用.方法:通过MTT法测定姜黄素抑制间质细胞的增殖效应;TUNEL法检测细胞凋亡;RT-PCR技术检测Bcl-2和Bax mRNA的表达;流式细胞术测定凋亡细胞周期的分布.结果:10,20,40 vLmol·L-1浓度的姜黄素对增生间质细胞的生长均有抑制作用,这种抑制作用具有时间/剂量依赖性(P<0.05).TUNEL结果:与阴性组相比,10,20,40 panol·L-1浓度的姜黄素可以诱导间质细胞发生凋亡,凋亡率依次为(20.52±2.52)%,(48.33±0.75)%,(84.60±0.57)%(P<0.01).RT-PCR结果:姜黄素作用于间质细胞24 h,Bcl-2/Bax mlLNA的水平下降(P<0.05).流式细胞检测发现姜黄素可以诱导人前列腺增生间质细胞周期阻滞于G.期,10,20,40μmol·L-1浓度的姜黄素组细胞G1期分别为(59.3 4±4.9)%,(65.2 4±5.1)%和(71.0±4.7)%.结论:姜黄素可以诱导人良性前列腺增生问质细胞发生凋亡,其机制可能与姜黄素改变凋亡相关基因Bcl-2和Bax mRNA的表达有关.     

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??OBJECTIVE To investigate the apoptosis effect of human hepatocellular carcinoma cell line SMMC-7721 induced by dihydroartemisinin in vitro and the possible mechanism. METHODS After treatment with 25, 50, 100, 200, and 400 ??mol??L^-1 dihydroartemisinin for 24 h. The proliferation inhibitory effect of dihydroartemisinin on SMMC-7721 cell was detected by MTT assay. Cell cycle and apoptosis were detected by flow cytometry. The change of apoptotic morphology was detected by confocal laser scanning microscopy. Rho 123 staining method was used to detect the changes of mitochondrial membrane potential. Western blot was used to detect expression of Bcl-2, Bax, Cleaved Caspase-3, Cleaved Caspase-9 and Cyto C. RESULTS MTT results showed that 25-400 ??mol??L^-1 dihydroartemisinin can inhibit the proliferation of SMMC-7721 cells obviously. The cell cycle detection results of flow cytometry showed that dihydroartemisinin could block SMMC-7721 cell cycle in G₂/M phase. The results of Hochest 333258 staining showed that the nuclei were heterogeneous, condensed and fragmented in the DHA treatment group. The cell apoptosis detection results of flow cytometry showed that the apoptosis rate of dihydroartemisinin treated groups were increased obviously (P<0.01). The results of Rho 123 staining showed that the mitochondrial membrane potential was decreased significantly (P<0.01). Western blot results showed that the expression of Bcl-2 was down-regulated, expression of Bax was up-regulated, the ration of Bax/Bcl-2 was increased and the expression of Cleaved Caspase-3, Cleaved Caspase-9 and Cyto C were up-regulated. CONCLUSION Dihydroartemisinin can induce apoptosis of SMMC-7721 cells, on the mechanism of apoptosis may be related to mitochondrial pathway.     

白藜芦醇联合姜黄素对SMMC-7721肝癌细胞作用

目的:观察白藜芦醇联合姜黄素对体外人肝癌细胞SMMC-7721增殖和凋亡的影响及相关信号通路.方法:不同浓度白藜芦醇、姜黄素及两药联合干预SMMC-7721细胞,MTT法检测细胞增殖,流式细胞术检测细胞凋亡、Hoechst 33258染色检测细胞凋亡形态变化,比色法检测半胱氨酸天冬氨酸蛋白酶(caspase)-3,caspase-8,caspase-9酶活性,Western blot法检测半胱氨酸天冬氨酸蛋白酶切割底物(PARP).结果:与对照组相比,白藜芦醇、姜黄素单独或联合作用SMMC-7721细胞均可抑制SMMC-7721细胞增殖,两药联合后抑制作用更显著.白藜芦醇、姜黄素联合较单独用药可增强SMMC-7721细胞凋亡,呈现凋亡形态改变,白藜芦醇、姜黄素及联合组细胞凋亡率分别为( 17.39±1.41)％,(14.96±2.23)％,(25.36±2.68)％;同时提高SMMC-7721细胞caspase-3,caspase-8及caspase-9活性,促使PARP蛋白剪辑.结论:白藜芦醇、姜黄素联合使用可增强对人肝癌细胞SMMC-7721的抗癌作用,并可能与caspase-8,caspase-9/caspase-3/PA RP信号通路介导细胞凋亡相关.     

沙蟾毒精诱导人肝癌SMMC-7721细胞凋亡及其机制的研究

目的观察沙蟾毒精诱导人肝癌SMMC-7721细胞凋亡的作用。方法用M,rr法观察沙蟾毒精对人肝癌SMMC-7721细胞增殖的影响：通过荧光染色、流式细胞分析等方法观察沙蟾毒精对细胞凋亡的影响：RT—PCR和Westernblot分析沙蟾毒精对Bcl-2、Bax、p53和p21等基因和蛋白表达的影响。结果沙蟾毒精对人肝癌SMMC-7721细胞的生长有明显的抑制作用,24h半数抑制剂量（IC50）为0．415μg／mL。细胞周期结果显示,人肝癌SMMC-7721细胞经不同浓度的沙蟾毒精处理后,G／M期细胞数量增加,而Go／G,期细胞数明显减少。RT—PCR和Westernblot结果显示,人肝癌SMMC-7721细胞经沙蟾毒精处理后,Bax的表达升高,而bcl-2的表达降低（P〈0．05）。结论沙蟾毒精可能通过线粒体凋亡途径诱导人肝癌SMMC-7721细胞凋亡。     

川楝素通过线粒体途径诱导人肝癌细胞凋亡

目的 探讨川楝素对人肝癌细胞SMMC-7721 (P53+)、Hep3B (P53－)凋亡及其对相关蛋白Bcl-2、Bax和Fas表达的影响。     

Induction of apoptosis in human hepatocarcinoma SMMC-7721 cells in vitro by flavonoids from Astragalus complanatus

Aim of the study

Flavonoids extracted from the seeds of Astragalus complanatus R.Br. reduce the proliferation of many cancer cells. The present study was carried out to evaluate the effects of these flavonoids from Astragalus complanatus (FAC) on human hepatocarcinoma cell viability and apoptosis and to investigate its mechanisms of action in SMMC-7721 cells.

Materials and methods

Cell viability was measured using the MTT assay. To detect apoptotic cells, SMMC-7721 cells treated with FAC were stained with Hoechst 33258 and subjected to agarose gel electrophoresis. Quantitative detection of apoptotic cells was performed by flow cytometry. The effects of FAC on apoptosis and cell cycle regulatory genes and proteins in SMMC-7721 cells were examined using an S series apoptosis and cell cycle gene array and Western blot analysis.

Results

The growth of SMMC-7721 and HepG2 cells was inhibited by treatment with FAC. Cell death induced by FAC was characterized by nuclear condensation and DNA fragmentation. Moreover, the cell cycle was arrested in the G0/G1 and S phases in FAC-treated SMMC-7721 cells. A sub-G1 peak with reduced DNA content was also formed. The activity of caspase-3 was significantly increased following FAC treatment. Microarray data indicated that the expression levels of 76 genes were changed in SMMC-7721 cells treated with FAC: 35 genes were up-regulated and 41 were down-regulated. Western blot analysis showed that caspase-3, caspase-8, Bax, P21, and P27 protein levels in SMMC-7721 cells were increased after 48 h of FAC treatment, while cyclinB1, cyclinD1, CDK1, and CDK4 protein levels were decreased.

Conclusions

These results suggest that FAC may play an important role in tumor growth suppression by inducing apoptosis in human hepatocarcinoma cells via mitochondria-dependent and death receptor-dependent apoptotic pathways.     

抗癌扶正方对人肝癌细胞SMMC-7721 PI3K/AKT信号通路的影响

目的:研究抗癌扶正方(KFP)对肝癌抑制作用的分子机制.方法:体外培养人肝癌细胞5MMC-7721,分别予以9.72,19.44,38.88 g·L-1的3个质量浓度的KFP作用于细胞,采用MTT法检测KFP对人肝癌细胞SMMC-7721生长增殖的影响,并通过Western Blot法检测KFP对人肝癌细胞SMMC-7721 PI3K/AKT通路凋亡相关蛋白表达的影响.结果:KFP以浓度及时间依赖的方式抑制人肝癌细胞SMMC-7721的增殖;Western Blot显示KFP作用于人肝癌细胞SMMC-7721后,人第10号染色体缺失的磷酸酶及张力蛋白同源基因(PTEN),caspase-9的活性增强,p-AKT的表达降低,且呈剂量依赖性.结论:KFP能增加入肝癌细胞SMMC-7721 PTEN的表达,进而抑制PI3K/AKT信号通路的激活,继之激活下游caspase-9促凋亡分子的表达,诱导人肝癌SMMC-7721发生凋亡.该研究表明PI3K/AKT信号通路在KFP诱导的人肝癌细胞SMMC-7721凋亡中起了重要作用.     

淫羊藿苷对食管癌细胞EC9706增殖与凋亡的影响

目的:探讨淫羊藿苷(icariin,ICA)对食管癌细胞EC9706增殖的影响,明确其作用机制。方法:ICA(40,160,640 nmol·L^-1)作用EC9706细胞48 h后,应用CCK8法检测EC9706细胞增殖;应用Hoechest33342染色和荧光显微镜检测细胞凋亡;应用逆转录-聚合酶链反应(RT-PCR)法检测B淋巴细胞瘤-2(Bcl-2),Bcl-2相关X蛋白(Bax) mRNA表达;应用免疫印迹法检测Bax,Bcl-2的蛋白表达。结果:ICA能显著抑制EC9706细胞增殖;ICA作用EC9706细胞出现细胞凋亡形态学改变;免疫印迹结果显示Bax蛋白表达减少,而Bcl-2蛋白表达增多。结论:ICA能显著抑制人食管癌EC9706细胞增殖,其凋亡作用机制可能与上调Bax蛋白,下调Bcl-2蛋白的表达相关。     

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??OBJECTIVE To investigate the effect of 1-cyclopropyl-6-fluoro-7-(piperazin-1-yl)-3-[5-benzylsulfanyl-4-(3,4,5-trimethoxybenzylidene) amino-4H-1,2,4-triazol-3-yl]-quinolin-4(1H)-one (M27) on apoposis in hepatocarcinoma SMMC-7721 cells in vitro. METHODS SMMC-7721 cells, colon adenocarcinoma cells(HCT-116)and leukemia cell line JURKET were treated by M27 with different concentrations for different time in vitro, the inhibitory effect of M27 and its precursor ciprofloxacin on the cell proliferation were examined by MTT assay. Cell apoptosis was determined by Hoechst 33258 fluorescence staining and TUNEL assay. The effect of M27 on topoisomerase ?? activity was measured using agarose gel electrophoresis by Plasmid pBR322 DNA as the substrate. Mitochondrial membrane potential(????m)was measured by high content screening imaging system. The p53,Caspase-9,Caspase-3,Caspase-8,Bcl-2,Bax and cytochrome C protein expressions were determined by Western blotting analysis. RESULTS The proliferation of the cancer cells was inhibited by M27 at 10-60 ??mol??L^-1 in time-and dose-dependent manner. Ciprofloxacin showed weak cytotoxicity against SMMC-7721 cell. SMMC-7721 cells treated by M27 with different concentrations for 24 h increased the percentage of apoptosis cells obviously (P<0.05) with a decrease in the mitochondrial membrane potential. Compared with control group, M27 influenced obviously DNA topoisomerase ?? activity, stimulated DNA cleavage and inhibited DNA reunion mediated by topoisomerase ??. In addition, M27 increased protein expression of p53, Bax, Caspase-8, Caspase-9, Caspase-3, as well as the cleaved activated forms of Caspase-9, Caspase-8 and Caspase-3 significantly, whereas the expression of Bcl-2 decreased. There was a significant increase of cytochrome C in the cytosol after 24 h of treatment with M27 and a decrease in the mitochondrial compartment. CONCLUSION M27 as a fluoroquinolone derivative exerted potent anticancer activity through the mechanism of eukaryotic topoisomerase ?? poisoning. The growth inhibition is mainly mediated via apoptosis-associated mitochondrial dysfunction and regulation of Bcl-2 signaling pathways.